"Even when the partial correlation coefficient is not strong, I observed a straight-line pattern in the residual plot.

Is it normal to see a straight-line relationship in every residual plot used to visualize partial correlation?"

  • My observation (straight-line in plot).
  • My confusion (low correlation vs. clear line).
  • My question (does this always happen?)

I want partial correlation plots for slightely non-linear data as well. How?

Thank you!

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